Strictly defined, precise path lengths misadjustment impossible 
Path lengths in standard model: 1.0 mm and 0.2 mm
Additional path lengths: 2.0 mm and 0.1 mm (optional)
Extremely small sample volumes: 0.7 μl – 10 μl
Large measuring range from approx. 6 – 8,500 ng/μl (dsDNA)* and approx. 0.1 – 100 mg/ml (protein)* 
No need to dilute samples 
Cap prevents evaporation of samples
Easy recovery of samples by pipetting 
Excellent reproducibility 
Quick and easy to clean 
Highly flexible 
Suitable for all current spectrophotometers 

https://www.hellma.com/en/laboratory-supplies/micro-volume-analysis-traycell/